How involved do you think Emperor Hirohito was in WW2?
He absolutely played a huge rill in the war and its direction. But he could only base his actions on what men like TOJO would tell him. We do know that, at the end of the war and immediately after the Hiroshima bomb was dropped, Hirohito wanted to accept the American terms. Tojo and his gang refused and the Japs got Nagasaki. The Emperor again stepped in and Tojo refused. Hirohito was adamant, and the war was over. The one term that the Americans agreed to was very wise. To ingore the roll played by the Emperor and allow him to stay on for official staus as figurehead only.
